According to the Texas Department of Public Safety, troopers conducted a traffic stop on Monday in the border city of Laredo. In a photo posted by investigators, the group is seen packed inside the back of the truck.
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The driver of the truck is now being investigated by the Department of Homeland Security.
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Last month, Gov. Greg Abbott deployed more than 1,000 DPS troopers and National Guard members to the border as part of Operation Lone Star - an initiative he first announced in March aimed at beefing up security at the border.
The governor later expanded those efforts to also tackle human trafficking at the border, including a plan for DPS troopers and Texas Rangers to interview unaccompanied minors that cross the border to identify potential human trafficking victims.
The Texas Tribune contributed to this report.